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Vintage Puegeot Front Derailleur and large chain ring issue

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Vintage Puegeot Front Derailleur and large chain ring issue

Old 04-20-12, 08:50 AM
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septacycles
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Vintage Puegeot Front Derailleur and large chain ring issue

I'm refurbishing a vintage peugeot mixte.

Every thing is dialed in pretty good except for shifting from the small to large chain ring. I've messed with the limit screw for hours and it either still will not shift to the large ring if limit is tightened or shift chain off large ring if loosend just a bit.

It seem like the chain ring and new chain I put on just aren't quite matching up. Any suggestions. The chain ring doesn't seem bent. It works okay if I shift the down tube shifters carefully and smoothly.
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Old 04-20-12, 09:39 AM
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Since it is a new chain it may indeed not be meshing properly especially if the old chain was excessively worn. Do a visual check to be sure that the chain rollers are meshing fully with the valleys between the teeth. If you are seeing clearance there the chain ring may be too worn for the new chain.
If the chain seems to fit OK make sure that the derailleur is aligned parallel to the chain and that the cage clears the large chain ring by no more than the thickness of a dime. Make your limit screw adjustments by 1/8 turn increments. If this bike lacks the modern shifting improvements it may indeed require a delicate touch on the shifters.
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Old 04-20-12, 09:42 AM
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Not sure what is happening here, but is it possible your chain is a couple of links too long? Or the chain is too narrow to "bite" on the teeth of the big chainring? New chainring, right?
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Old 04-20-12, 10:47 AM
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Okay that give me a few things to try... chain is new chainrings are old but look decent. I'm may try taking a link out of the chain.
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Old 04-20-12, 11:13 AM
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If the big chainring makes a grinding noise when you ride with the new chain, you may want to put a couple hundred miles on your big ring so the new chain can wear in the old chainring.
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Old 04-20-12, 01:04 PM
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Originally Posted by septacycles View Post
Okay that give me a few things to try... chain is new chainrings are old but look decent. I'm may try taking a link out of the chain.
It is difficult to visually judge wear on chainrings and cogs until they are really trashed. Before you shorten your chain check to be sure you will still have enough to fit on the big ring-big cog combo or you risk damaging your derailleur or frame. NEVER run a chain which is too short to do this except in an emergency.
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Old 04-20-12, 02:14 PM
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when i put the new chain on... I was about 1 link longer than the old chain... but I measured the new chain by putting it around the larges sprocket in the rear and large chain ring in the front and added two links. Its not too bad but i'm fixing this to re-sell and want it shifting cleaner before I let it out of the shop.

Thanks

Ian
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Old 04-21-12, 09:38 PM
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It is good to remember that the tension on the front and rear derailleurs increases as the you pull back on the shift levers, i.e. when the FD and RD are shifted to the "inboard" positions; in other words when you shift from the big chain ring to the smaller chain ring(s) or from smaller rear sprockets to bigger rear sprockets. If the FD cage is properly alligned and limit screws are properly adjusted and you still have a problem shifting to the smaller chainring(s), the problem is most likely in the cable linkage to the FD or in the front shifter itself.
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Old 04-21-12, 09:54 PM
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Originally Posted by neurocop View Post
It is good to remember that the tension on the front and rear derailleurs increases as the you pull back on the shift levers, i.e. when the FD and RD are shifted to the "inboard" positions; in other words when you shift from the big chain ring to the smaller chain ring(s) or from smaller rear sprockets to bigger rear sprockets. If the FD cage is properly alligned and limit screws are properly adjusted and you still have a problem shifting to the smaller chainring(s), the problem is most likely in the cable linkage to the FD or in the front shifter itself.
I should add that there could also be a problem with the FD "return spring" tension or the FD.
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Old 04-23-12, 08:54 AM
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got it worked out... FD had to be lowered so it was only about a nickles width clearance from the large chain ring. I should have know that but I just assumed the FD was in a good position since it was still original. Bike came out good.





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